Patent US2975290A successfully refreshed from Google Patents.
US3929148A
Expired / Lapsed
US
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Differential and proportional pneumatic amplifiers
Assignee: MECI MATERIEL ELECT CONTR
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Filing: 1974-11-04
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Granted: 1975-12-30
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Expires: 1994-11-04
Abstract
Abstract A differential and proportional pneumatic amplifier in which the input stage comprises a first chamber divided by a first membrane into a first compartment which is provided with a first pressure input and into a second compartment which is provided with a second pressure input. The first input directly receives a pressure P1 and the second input receives a pressure P2 via a pneumatic resistance. The second compartment has a first outlet aperture which may be closed by the first membrane under the influence of the pressure P1, said aperture providing a flow Q proportional to the pressure difference P2 - P1. A second stage of the amplifier comprises a second chamber divided by a second membrane into third and fourth compartments. The third compartment receives flow Q through a third input connected to the first aperture and has an output channel connected to the atmosphere provided with a pneumatic resistance such that the pressure P prevailing in the third compartment is proportional to flow Q and thus to the difference of the pressures P2 - P1. The fourth compartment, in which atmospheric pressure prevails, has a second outlet aperture forming the nozzle of a nozzle-palette device which is closed to a greater or lesser degree by the second membrane which acts as a baffle under the influence of the pressure P such that the output pressure Ps of said nozzle-baffle device is proportional to the pressure P.
Inventors
- 👤 Michel Midy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:11
CPC Classifications
F; F15; F15C; F15C3/00; F15C3/04; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2365
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
262 words
A differential and proportional amplifier comprising: a first stage chamber divided by a first membrane into a first compartment and a second compartment, the first compartment having a pressure input and the second compartment having a pressure input, the pressure input of the first compartment being directly connected to a pressure source providing a pressure P1, the pressure input of the second compartment being connected by a pneumatic resistance to a pressure source providing a pressure P2, the second compartment having an outlet opening which is closable by the first membrane under the influence of the pressure P1, the outlet opening of the second compartment providing a flow Q proportional to the pressure difference P2 P1, and a second stage chamber divided by a second membrane into a third compartment and a fourth compartment, the third compartment having an input connected only to the outlet opening of the second compartment for receiving the flow Q, the third compartment also having a separate output channel connected only to the atmosphere through a penumatic resistance, such that in the third compartment there prevails a pressure P proportional to the flow Q and thus to the pressure difference P2 - P1, the fourth compartment being at atmospheric pressure and including an exhaust opening, the exhaust opening forming a nozzle which is closable by the second membrane to thereby act as a baffle under the influence of the pressure P and provide an output pressure Ps from the fourth compartment which is proportional to the pressure P and consequently to the pressure difference P2 - P1.
Claim 2
Dependent Claim
262 words
A differential and proportional amplifier comprising: a first stage chamber divided by a first membrane into a first compartment and a second compartment, the first compartment having a pressure input and the second compartment having a pressure input, the pressure input of the first compartment being directly connected to a pressure source providing a pressure P1, the pressure input of the second compartment being connected by a pneumatic resistance to a pressure source providing a pressure P2, the second compartment having an outlet opening which is closable by the first membrane under the influence of the pressure P1, the outlet opening of the second compartment providing a flow Q proportional to the pressure difference P2 P1, and a second stage chamber divided by a second membrane into a third compartment and a fourth compartment, the third compartment having an input connected only to the outlet opening of the second compartment for receiving the flow Q, the third compartment also having a separate output channel connected only to the atmosphere through a penumatic resistance, such that in the third compartment there prevails a pressure P proportional to the flow Q and thus to the pressure difference P2 - P1, the fourth compartment being at atmospheric pressure and including an exhaust opening, the exhaust opening forming a nozzle which is closable by the second membrane to thereby act as a baffle under the influence of the pressure P and provide an output pressure Ps from the fourth compartment which is proportional to the pressure P and consequently to the pressure difference P2 - P1.
Claim 3
Dependent Claim
68 words
Apparatus according to claim 1 including a copying chamber divided by a third membrane into a fifth compartment and a sixth compartment, the fifth compartment having a pressure input directly connected to the pressure source P2, the sixth compartment having an exhaust opening connected to the atmosphere and also having an output channel providing the pressure P2 which is connected to the pressure input of the second compartment.
Claim 4
Dependent Claim
18 words
Apparatus according to claim 2 in which the pneumatic resistances are provided by apertures formed in the membranes.
Claim 5
Dependent Claim
34 words
Apparatus according to claim 3 in which the pneumatic resistance of the first chamber comprises an aperture formed in the membrane of the first chamber and located outside the compartments of the first chamber.
Claim 6
Dependent Claim
80 words
Apparatus according to claim 4 in which the nozzle-baffle device includes a pressure input located remote from the nozzle and connected by a pneumatic resistance to a pressure source providing a pressure Pa, the pressure input of the sixth compartment being connected by a pneumatic resistance to the pressure source Pa, and in which the pneumatic resistance of the second chamber and the pneumatic resistance of the nozzle-baffle device comprise corresponding apertures formed in the membrane of the second chamber.
Claim 7
Dependent Claim
30 words
Apparatus according to claim 5 comprising a stack of disks in which are formed said compartments and the input and output passages therefor, said membranes being gripped between the disks.
Claim 8
Dependent Claim
30 words
Apparatus according to claim 4 comprising a stack of disks in which are formed said compartments and the input and output passages therefor, said membranes being gripped between the disks.
Claim 9
Dependent Claim
80 words
Apparatus according to claim 3 in which the nozzle-baffle device includes a pressure input located remote from the nozzle and connected by a pneumatic resistance to a pressure source providing a pressure Pa, the pressure input of the sixth compartment being connected by a pneumatic resistance to the pressure source Pa, and in which the pneumatic resistance of the second chamber and the pneumatic resistance of the nozzle-baffle device comprise corresponding apertures formed in the membrane of the second chamber.
Claim 10
Dependent Claim
30 words
Apparatus according to claim 3 comprising a stack of disks in which are formed said compartments and the input and output passage therefor, said membranes being gripped between the disks.
Claim 11
Dependent Claim
18 words
Apparatus according to claim 1 in which the pneumatic resistances are provided by apertures formed in the membranes.
Claim 12
Dependent Claim
33 words
Apparatus according to claim 1 in which the nozzle-baffle device includes a pressure input located remote from the nozzle and connected by a pneumatic resistance to a pressure source providing a pressure Pa.
Claim 13
Dependent Claim
85 words
Apparatus according to claim 11 including a copying chamber divided by a third membrane into a fifth compartment and a sixth compartment, the fifth compartment having a pressure input directly connected to the pressure source P2, the pressure input of the sixth compartment being connected by a pneumatic resistance to the pressure source Pa, the sixth compartment also having an exhaust opening connected to the atmosphere and an output channel providing the pressure P2 which is connected to the pressure input of the second compartment.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |